9949721 has 2 divisors, whose sum is σ = 9949722. Its totient is φ = 9949720.

The previous prime is 9949717. The next prime is 9949733. The reversal of 9949721 is 1279499.

It is a happy number.

9949721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9066121 + 883600 = 3011^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 9949721 - 2² = 9949717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9949741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4974860 + 4974861.

It is an arithmetic number, because the mean of its divisors is an integer number (4974861).

Almost surely, 2^9949721 is an apocalyptic number.

It is an amenable number.

9949721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9949721 is an equidigital number, since it uses as much as digits as its factorization.

9949721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 9949721 is about 3154.3178343344. The cubic root of 9949721 is about 215.0817860831.

The spelling of 9949721 in words is "nine million, nine hundred forty-nine thousand, seven hundred twenty-one".